Invalid argument to operation ++/--

Hi what I want is to give a player a point every hour, the code I was gave:
I get Invalid argument to operation ++/--
playersOnline.put(p.getName(), playersOnline.getValue(p)++);

Code:java

 
[LIST=1]
[*]HashMap<String, Integer> playersOnline = new HashMap<String, Integer>();
[*]
 
[*]new BukkitRunnable(){
[*]@Override
[*]   public void run() {
[*]     for (Player p : Bukkit.getOnlinePlayers()) {
[*]     if(!playersOnline.contains(p.getName())) playersOnline.put(p, 0);
[*]      playersOnline.put(p.getName(), playersOnline.getValue(p)++);
[*]     if(playersOnline.get(p.getName()) > 5){
[*]         // Do stuff.
[*]     }
[*]     }
[*]   }
[*]}.runTaskTimer(this, 0L, (20*60)*5L);
[/LIST]
[syntax/]
Any help at all is apreciated

 

@Jack3885

Code:

playersOnline.getValue(p) + 1

 

Did you try

Code:

[*] playersOnline.put(p.getName(), playersOnline.getValue(p)+1);

 

increment and decrement operators only work on variables, not values.

Code:java

Map<String, Integer> test = new HashMap<>();
test.put("example", 42);
test.get("example")++; //bad
Integer example = test.get("example");
example++; //fine
example = 42++; //bad